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Backlight Brightness Control for Embedded Systems

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Backlight Brightness Control for Embedded Systems

Executive Summary
The Intel® Atom™ E6xx processor has the ability for dynamically controlling the internal LVDS display backlight brightness using Pulse Width Modulation. This feature opens up many usage possibilities for embedded systems, such as dimming the internal LVDS display in IVI systems when entering a tunnel. Customers could also create an application that allows the user to control the internal LVDS brightness, for example using software buttons on a handheld touch screen device.
This paper describes the method to implement dynamic internal LVDS backlight brightness control as a software user application to work with Intel® Embedded Media and Graphics Driver (Intel® EMGD). This paper covers the platform design for Intel Automatic Display Brightness Adjustment. The methods described are operating system- and programming language-independent.
This paper does not cover details of the API for programming, however, it describes how to use the Legacy Backlight Brightness PCI Configuration Register to dynamically control the backlight intensity.

Benefits of these methods:
•Removes the need for mechanical potentiometers to control internal LVDS Backlight Brightness resulting in a much cleaner mechanical design.
•Allows developers to integrate internal LVDS backlight control into their embedded system software.
•Intel Automatic Display Brightness Adjustment gives hardware level control over the backlight brightness.

Read the full Backlight Brightness Control for Embedded Systems White Paper.